Dioniso's entry to MSXdev is a puzzle/action game called ZERO and the castle of infinite sadness. Contrary to those who know their rock music might expect, there is no Smashing Pumpkins in this game. Clean every room of the castle from evil forces, starting from the the top and going down to the base. Sounds simple enough, right?
Relevant link: MSXdev'14 #6 - ZERO and the castle of infinite sadness